CN211557578U - LED projection lamp driving circuit with humidity detection function - Google Patents

Abstract

The utility model relates to a LED projecting lamp drive circuit with humidity detects function, including DC power supply input unit, IC supply circuit, digital signal input unit, misconnection protection unit, total return circuit current detection unit, total return circuit voltage detecting element, driver, LED open a way detecting element, single chip module, DAC digital-to-analog converter, data isolation input unit and temperature detecting element and be used for detecting the humidity change in the lamps and lanterns cavity, utilize the humidity change monitoring lamps and lanterns leakproofness's in the lamps and lanterns cavity humidity detecting element. The utility model discloses increased humidity detecting element on the basis of original circuit, when the humidity exceeds standard in the lamps and lanterns, the humidity chip can directly be judged, gives the singlechip with data transmission, then the singlechip is through explaining with data transmission to control system or automatic execution trouble lamps and lanterns signal isolation, and the system sends alarm command with lamps and lanterns return circuit outage signal to the security and the stability of whole circuit have been guaranteed.

Description

LED projection lamp driving circuit with humidity detection function

The technical field is as follows:

the utility model relates to a LED drive circuit technical field especially relates to a LED projecting lamp drive circuit with humidity detects function.

Background art:

with the wide application of LEDs, LED driving technology is becoming mature. The LED driving circuit is used for outputting constant current to the LED load so as to drive the LED lamp to normally work, and mainly comprises a voltage regulating circuit, a power conversion circuit and a control circuit. The control circuit is used for controlling the main switching tube in the power conversion circuit to be conducted intermittently, so that an input voltage signal received by the power conversion circuit is converted into a constant current signal and is output to the LED load, and the voltage regulating circuit is used for enabling the output voltage value to be constant. In the voltage regulating circuit and the power conversion circuit, an inductance element is indispensable. However, the existing LED lamp driving circuit has a complex structure and poor circuit stability, and the safety monitoring on the whole circuit is less, so that the whole circuit is not safe enough. Therefore, the LED projection lamp driving circuit of CN109302773A previously applied by the company is improved, and misconnection protection, input protection and temperature detection are arranged, so that the whole circuit is safer.

However, many outdoor lamp housings are made of metal, the metal has conductivity, although the design protection grade of the lamp is not less than IP65, the lamp is used for a long time in four seasons, the lamp protection lamp is easily lowered, and the problem of water seepage of the lamp is caused.

The utility model has the following contents:

not enough problem to LED projecting lamp drive circuit before, the utility model provides a LED projecting lamp drive circuit with humidity detects the function.

The utility model discloses a realize through following technical scheme: the utility model provides a LED projecting lamp drive circuit with humidity detects function, includes DC power supply input unit, IC power supply circuit, digital signal input unit, misconnection protection unit, total return circuit current detection unit, total return circuit voltage detecting element, driver, LED open circuit detecting element, single chip module, DAC digital-to-analog converter, data isolation input unit and temperature detecting element, still including being used for detecting the humidity change in the lamps and lanterns cavity, utilize the humidity change monitoring lamps and lanterns leakproofness's in the lamps and lanterns cavity humidity detecting element.

In a preferred embodiment of the present invention, the humidity detecting unit is a honeywell HIH6021 chip.

The pins 1 and 2 of the chip of the HONEYWELL HIH6021 are connected with a ceramic capacitor in parallel to provide a power supply for the chip, and the pins 3 and 4 feed back an I2C signal to the circuit singlechip module.

The utility model has the advantages that: this LED projecting lamp drive circuit with humidity detects function has increased humidity detecting element on original circuit's basis, and when the humidity exceeded standard in the lamps and lanterns, the humidity chip can directly be judged, gives the singlechip with data transmission, then the singlechip is isolated with data transmission to control system or automatic execution trouble lamps and lanterns signal through interpreting, and the system sends alarm command and closes off the power supply circuit signal with lamps and lanterns to the security and the stability of whole circuit have been guaranteed.

Description of the drawings:

fig. 1 is a circuit diagram of the driving circuit of the LED projector with humidity detection function of the present invention;

FIG. 2 is a schematic diagram of a 4-way LED lamp driving circuit of the present invention;

fig. 3 is a schematic circuit diagram of the dc power input unit of the present invention;

FIG. 4 is a schematic circuit diagram of the IC power supply circuit of the present invention;

FIG. 5 is a schematic diagram of two-path main loop detection units in the present invention;

fig. 6 is a schematic circuit diagram of the data output unit of the present invention;

FIG. 7 is a schematic circuit diagram of a single chip microcomputer according to the present invention;

fig. 8 is an overall circuit schematic diagram of two-path data isolation according to the present invention;

fig. 9 is a schematic circuit diagram of two paths of temperature detection in the present invention;

fig. 10 is a schematic diagram of the circuit for analog signal rotation according to the present invention;

fig. 11 is a circuit diagram of the humidity detecting unit according to the present invention.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be clearly and clearly defined.

The driving circuit of the LED projector with humidity detection function shown in fig. 1-11 comprises

A direct current power input unit 1 with positive and negative reverse connection protection, overcurrent protection, filtering and pulse absorption;

an IC power supply circuit 2 that supplies power to each device in the entire circuit;

a digital signal input unit 13;

a misconnection protection unit 3 connected with the data input of the digital signal input unit 13 for preventing high voltage connection to the signal line;

a total loop current detection unit 14 connected to the dc power input unit 1 for detecting a current flowing through the line and checking out current data by using an amplification factor of the amplifier;

a total loop voltage detection unit 4 connected with the direct current power supply input unit 1 and used for detecting the voltage on the line and checking out the voltage data by using a voltage division resistor;

the LED lamp driving circuit is provided with 4 paths of drivers 5 which respectively drive LED lamps with different colors, provide constant current drive for LEDs with corresponding colors and simultaneously adjust the light by PWM and ANA;

the LED open circuit detection unit 6 is connected with the driver 5 of each branch circuit and is used for detecting whether the corresponding branch circuit is open or not;

the singlechip module 7 is used for receiving the data in the circuit, checking and processing the data, and then feeding back the checked data of each test point;

the DAC digital-to-analog converter 8 is connected with the singlechip module 7 and is used for outputting analog signal conversion and finally obtaining the work of the corresponding 4-channel driver 5;

a user obtains the temperature of the chip positions of the DAC digital-to-analog converter 8 and the single chip microcomputer module 7, and then the temperature of the corresponding chip is detected by using the temperature, so that two groups of temperature detection units 9 for simultaneously detecting multiple groups of addresses are realized;

the first data isolation input unit 10 is used for connecting the singlechip module 7 and the misconnection protection unit 3 to realize isolation of input data, so that the singlechip module 7 is protected from isolating surge pulses on a data line, and the control system can run more stably;

and a humidity detection unit 15 for detecting the humidity change in the lamp cavity and monitoring the sealing performance of the lamp by using the humidity change in the lamp cavity.

The single chip microcomputer module 7 is further connected with a data output unit 12 which utilizes a line relay to realize the influence of disconnection on a rear end circuit and simultaneously writes address data at the rear end circuit, and the data output unit 12 is connected with the single chip microcomputer module 7 through a data isolation unit 11.

The first data isolation input unit 10 is used for isolating a surge pulse signal on a data line.

The misconnection protection unit 3 is a protection device which is in an open circuit state when the high voltage is misconnected, no signal is output, the circuit has no trigger voltage input, and the whole circuit does not work.

As shown in fig. 11, the humidity detection unit 15 selects a honeywell HIH6021 chip, pins 1 and 2 of the honeywell HIH6021 chip are connected in parallel with a ceramic capacitor CH1 to provide a more stable and clean power supply for the chip, and pins 3 and 4 feed back an I2C signal to the circuit single chip microcomputer module, and meanwhile pull-up resistors RH1 and RH2 are respectively placed to make the feedback signal more stable. When getting into a large amount of liquid in the lamps and lanterns, the humidity chip can directly judge, gives singlechip module 7 with data transmission, and then singlechip module 7 is with data transmission to control system, and the system sends the instruction and cuts off power supply to the lamps and lanterns return circuit, because every grade all has unique ID, can confirm immediately that a certain lamps and lanterns intake. A small amount of water seepage indicates that the lamp has tiny holes or leaks, the cavity of the lamp is in a relatively sealed state at the moment, when the lamp works, the lamp generates high heat per se to evaporate water in the cavity of the lamp, and then the humidity reaches a system set threshold value, and the power supply of a lamp loop can be automatically cut off.

The following is a detailed description.

Firstly, when a large amount of liquid enters the lamp:

the humidity chip can directly judge, gives singlechip module 7 with data transmission, then singlechip module 7 with data transmission to control system, the system sends alarm command and cuts off the power supply circuit signal with lamps and lanterns, because every lamps and lanterns all have unique ID, can confirm immediately that a certain lamps and lanterns intake, convenient quick maintenance.

Secondly, when micro water seepage occurs in the lamp:

the lamp is provided with tiny leaks or leak holes or gaps, the lamp cavity is in a relatively sealed state at the moment, when the lamp works, the lamp generates high heat per se, water in the lamp cavity is evaporated, then the humidity reaches a system set threshold value, the unit 15 sends the humidity data to the single chip microcomputer module 7, the single chip microcomputer module 7 makes a judgment instruction according to the humidity data, sends the instruction to the data isolation unit 11, the address lamp signal is cut off, and early warning is carried out on the system.

Finally, it should be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (3)

1. The utility model provides a LED projecting lamp drive circuit with humidity detects function, includes DC power supply input unit, IC power supply circuit, digital signal input unit, misconnection protection unit, total return circuit current detection unit, total return circuit voltage detecting element, driver, LED open circuit detecting element, single chip module, DAC digital-to-analog converter, data isolation input unit and temperature detecting element, its characterized in that: the lamp sealing device further comprises a humidity detection unit for detecting the humidity change in the lamp cavity and monitoring the lamp sealing performance by utilizing the humidity change in the lamp cavity.

2. The driving circuit of the LED projector with humidity detection function as claimed in claim 1, wherein: the humidity detection unit adopts a Honeywell HIH6021 chip.

3. The driving circuit of the LED projector with humidity detection function as claimed in claim 2, wherein: the pins 1 and 2 of the HONEYWELL HIH6021 chip are connected with ceramic capacitors in parallel to provide power for the chip, and the pins 3 and 4 feed back an I2C signal to the circuit singlechip module.

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